I’ve put a bit of ‘table’ effort in and combined the numerous Lync 2010 releases and their KB’s with the Lync 2013 information. Hope this quick reference helps! (and that this formats properly on the web!)

Product

Version

KB Article

 

Lync 2013

5.0.8308.556

2809243

Lync 2013 SDK

5.0.8308.556

2809243

Lync 2010 (64bit client)

4.0.7577.4409

2884632

Lync 2010 (32bit client)

4.0.7577.4409

2884632

Lync 2010, Group Chat Client

4.0.7577.4409

2884627

Lync Server 2010, Group Chat Administration Tool

4.0.7577.4409

2884631

Lync Server 2010, Group Chat Server

4.0.7577.4409

2884623

Lync Server 2010

4.0.7577.223

2493736

Lync Phone Edition (for Aastra 6721ip and Aastra 6725ip)

4.0.7577.4411

2889241

Lync Phone Edition (for HP 4110 and HP 4120)

4.0.7577.4411

2889243

Lync Phone Edition (for Polycom CX500, Polycom CX600, and Polycom CX3000)

4.0.7577.4411

2889246

Lync Phone Edition (for Polycom CX700 and LG-Nortel IP Phone 8540)

4.0.7577.4411

2889244

Some links above may not be live just yet but will be shortly!